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In the CNAS-Tale sub-story 'CNAS' real origin' TheNitroFlamer appears as the work partner of W. D. Gaster and a main contribution to the creation of CNAS.
In this timeline TNF appears as a tall human with dark blonde hair, blue eyes and bags under his eyes. He wears a pale green turtleneck sweater, black pants held up by a gold-buckled belt and brown sneakers.
TNF is a workaholic obsessed with his scientific research spending most of his time working, rarely getting any sleep just to focus on his job. He usually doesn't react much to humor, and doesn't really show much real emotion aside from the work in which he invests his time into.